Variable-speed gear



Nov. 13, 1928. 1,691,389

C. R. GARRARD ET AL VARIABLE SPEED GEAR Filed March 8. 1928 2 Sheets-Sheet l Nov. 13, 1928. 1,691,389

c. R. GARRARD ET AL VARIABLE SPEED GEAR Filed March 8, 1928 2 sheets-sheet 2 Vaio 'Patented Nov. 13,1928. i

UNITED s TA CHARLES RILEY Ganar-aan AND ,ERNST lcm'r'rnnsn FAUsEa, )or .SYDENAE Enom@ vARIABLasPEED GEAR.

Application Lrneajnlramh 8', 192s, seriaino. 260344, anla n; Great Britainmarcn 25', 1927;

rlhis inventionirelatesto Vvariable speed gearing and comprises the combination of.,

a variable speed'gearing of the type in'which the motion of one shaft imparted to 'the other shaftthrough thev engagement. with the face of a disc, wheel ycarried by one shaft ers, and laniepicyclic train of gearing be' tweentlieV two rollers, and vhas for its object to provide areduction gear having a zero position while the gear is in ullk pressure Contact, which is not dependent on large rictional areas for :its efficiency. Y `iWe. attainfthisfend by the construction .shown in the accompanying drawings in which t-Figures 1 and 2 are views in sectional plan and sectional elevation Showing va gear irl-which the driving and driven shafts are arranged' at right angles -t'oleach other the' latter figure beingv a section on line-2, 2.7 Figure'vl, and Figures 3 ande are 'similar views showing a -gearin-whic'h lthe driving'and driven shafts are' in axial alignment, 'the former rigure'being asection on line 3, 3 Figure i, andthe latter figure being a section on line 4, 4f Figure'i. n l

Throughout the views similar parts 'are marked with like numeralso'f reference.

In the construction yshown-in Figures -1 and 2 the driving shaft'l 'zis located at-rigli-t angles to the driven lshaft v2 the disc wheel '3 being mounted and iXedV on the driving shaft 1. The driven shaft. 2 whiclicomprises eitlierdirect orby ya sprocketwheel 11-ifs mounted on a 'splined yshaft l5 .said sleeve and v shaft running on bearings 1(2,and 13 carried bythefbox 10 of the gear. y The primaryL froll'ers 4 and-fthe secondary roller 4a" which vContact with one face oit the disc wheel 3 and are located on opposites'ides of the centre of the disc Vwheel andare-*adapted to .he vmoved aerossfthe face of the disc `Wheeltogetlier are formed in one with the sun wheels 6 and 6a of' an -epicyclic train of gear-ing the planet wheels 1'810i which-are carried bythe coarse pitch screw 9 threaded into the case .10 of the gearing and carrying a' thru-st bear`- ing 13 for theshaft 5', said serewvbeing `providedywith an exterior lever which .can be rotated.y In the position shownin Figure 1 the gear isrin its Vneutral positionV as any movement imparted'by thefdisc'wheel by the movement off the roller' in the re- `verse direction `so that the planet wheels 8 simply] revolve around' their axes without ,imparting any rotatingfmovement 4tofthn:

frame 7 and ytherefor-etto Ythe driven shaftl 2through the shaft 5. Movement either-ollers and epicyclic gear to vthe left will cause.

J3 to the roller tis `balanced and connteracted 1 To increase 'the frictional grip between the `rollers and the disc wheel auxiliary rollers 12and 12a are employed toengage-the other side of vthe disc wheelfand-binding rings 14 Vand 14y being employed -tofengage the yprirmary `and VSecondary rollers ,4 and 4 and the-auxiliary rollers ,12 and 12 the latter through yinterr'n'ediate rollers 13 and 1W which are introduced solely Vokr the purpose of vpreserving` the direction of rotation of said Yenga-ging parts. Although 'the aux/iliary Yand intermediate rollersand tlfiebinclingl rings lwill be constrained to' follow the mave-v ments of the primary andseoondary rollers vsaid auxiliary rollers Vmay be coupled to the primary and-secondaryand intermedi-1,

ate rollers b the usual 'orked couplings, 'the grooves' or Vwhio'hi-ny the anxiliaryand intermediate rollers -onlyiarefsliown 'Y lfVhen thel driving and driven ysliafts '1 and 2 are arranged iny axial alignment als ,shown inFig-ures 3 and A1 the disc wheelis arranged to be moved 'transverselyrelative tothe rollers 74 and 4E, andthe auxiliary rollers 12 and' '12l and the "intermediatel rollers V13 andr 13,v the roller 4 being,` mounted as aliirture-on the ydr'win-g shaft 1, `and the lettere! loosely :on the driven shaft 2'on which-is fixed the frame T( carrying. Vthe planet wheels 8 ,of the epi- :t'rame 7 of said train which is mounted to cyclic/train.v vThis construction enables the Y' relative movement between the dise wheel and the primary and secondary rollers to take place in both -dire'etionsjby'whicli a1 reverse drive-can 'befv imparted to the driven shaft. Thedisc wheel Bis arranged to float between the auxiliary rollers 12 and :1W-and the intermediate rollers and 13* fthe aux-I g iliary rollers contacting the primary and secvondary rollers l and 4a. The disc wheel is arranged to slide transversely in any con-` veiiient manner such-'as that illustrated in 5 which it is mounted on a bearing 1.5 which is supported by two pairs of links 16 and 'I' whichare so arranged that'the disc wheel is free to swing transverselyv in an approximatelyy straight line, onepair of links, V16 being gpivoted at -lf3-to thecase l() ofthe gear and the other pair 17 being mounted Ona shaft 19 which is capable of being rotated by 'means exterior to said case. y V

lt will 'be obvious that further or other variationsofthe ratio'of speed between the driving and driven shaft may be arrived at by varying the relative sizes ofthe two Vprirollers orby varying the positions of theprimary and secondary Arollers relative tothe disc wheehand/orby varying the sizes of the. primary wheels ofthe epicyclic gearwhich are in couple with said rollers.

. What we claim is l. vA variable speed gear comprising a driving shaft, a driven shaft, a disc wheel mounted on the driving shaft, two rollers mounted loosely on the driven shaft and lin frictional i contact with oneffface of said disc wheel one oneach side ,of the` axis of said wheel said 0 rollersbeing freeV to traverse the face of the disc wheel, an .epicyclic gear-,coupling said .two Arollers together the primary wheels of lsaid gearbeing respectively 'in couple with oneV ofsaid rollers and thel element of said geai`- .-carrying the planetl wheels being mounted on the driven shaft, two auxiliary rollers in frictional Contactt with the other Yface of the disc wheel, two intermediate rollers in frictionalcontact with the auxiliary rollers,ya loose" binding ring encircling the mainrollersand the auxiliary rollers, and j meansy for traversing the epicyclic gear and the ymain'rollers'transversely'relative to the `facel off' the disc wheel. f

on the driving shaft, twovrollers mounted loosely-'ongthe driven shaft and in frictional Contact with one face of said disc wheel one on each sideof'the centre of said wheel, said rollers being free to traverse the face of the disc wheel, an epicyclic gear coupling said two rollers'togethertheprimary `wheels of said'gear being respecti-velyin couple with one of said rollers andl the element of said Vgear :carrying ,the lplanet 'Vwheels being mounted oli-'the driven shaft, two auxiliary rollers in frictional contact with the other face of-the discv wheel, two'intermediate rollers in frictional -contact with the auxiliary. rollers, a loose binding ring encircling the 4mainrollers vand the auxiliary rollers, and means for traversing the epicyclic gear and `the friction rollers transversely relative to the face of the disc wheel.

ment with the other roller andllocated on the tween lthe auxiliary l rollers 'and the loose 5.A In combination with ya Idriving..and a i driven shaft of a variable speed. gearing consisting of a discwheel in couple '-withthe o driving shaft and a rollerin frietional conf2. Avariablefspeed gear comprising a drivv lng shaft, a driven shaft, adisc wheel mounted 3. A gear consisting ofa yvariable speed gearing of the friction 'disc and' roilertype, acouple between said gearing andthe driving shaft, a secondary l'main roller infrictional contact with the disc wheel in axial align- 7( other side ofthe centre Yof the disc wheel, auxiliary rollers coacting with the dise wheel, looserings encircling Leach pair of mainand auxiliary rollers, intermediate rollers berings, a couplingobetween said' two rollers whereby they are constrained to movetrans versely across the face yof the disc wheel together, an epicyclic train of gearing between the two main rollers the 'primary wheels `of said train being coupled Yrespectlvelyto said `two rollers and the frame ofthe train' carrying the planet wheels of said train'being coupled to the shaft to be driven, and means for traversing the two main 'rollers across the disc wheel. Y f` l. A gear consisting of a variable speed gearing of the friction disc and roller type, a couple between said gearing andthe driving shaft, a secondarymain roller fin frictional contactwith the disc wheel in axial alignment with the other roller andl located-on the othery side ofthe centre of the disc wheel, auxiliary rollers coacting with the disc lwheel and located 'on the opposite side ofsaidfwheel to the main rollers, loosel rings encircling each pair of main andl auxiliary,rollers,.,interrnevdiate rollers between the auxiliary rollers-and `the loose rings, an epicyclie train. of-gearingl we between the two main rollers "the primary wheels of said jtrain being `coupled respectween the dise wheel and the main and auxiliaryrollers.-

tact with Vandi adapted to have transverse v movement relative toV said; disci` wheel vloetween itscentre andV its periphery, al secondy roller in axial alignment withthelirstrroller and in frictionalcontact with the discwheel on the opposite side of-,its centre to theffirstv` roller and adapted to have transverse movement relative tothe dise wheelinunison with theffirst roller and-of an lepicyclic trainl of gearing kbetween said vtwo rollers each priv mary wheelof said train being in couplewith one of the two rollers of vthe variable speed gear and the frame carrying the planet wheels ofthe epicyclic train being mounted in couple with 'the driven shaft. i f

.76. Incombination, a driving and a driven shaft, a variable speed gearing-comprising a disc wheel in couple with the driving shaft, a 130,

being coupled tothe shaft to bevdrivemand 105 f `means for causingY relative movement .b e-

disc wheel and -a roller in frietional Contact with and adapted to have transverse Inovement relative to saiddiso wheel between its centre and its periphery, a second main roller` in aXial alignment withvtlielirst roller andv in rictional Contact with tlie disewheel on the opposite sdeof its centre to the point ofcontact of the first roller and adapted to have transverse kmovement relative to the disc,

wheel in unison with the first roller, two auxiliary rollers adapted'to Contact the disc wheel on the opposite side tothe main rollers Y and to move across the dise Wheel in unison with said main rollers, a. loose binding ring encircling andengaging each pair of main and auxiliary rollers, an intermediate rollerr between each auxiliary roller and'itsbinding ring, andmeans for impartingrelative movementto the dise wheel Yand the two main rollers, and an epioyclic train of gearingy between said two rollers each, rimaryk wheel of vsaid train being in couple with one of the two rollers `of the variable speed gear and the 

